plural spacers
Definition of spacer
: a device or piece used to create or maintain a desired amount of space (as between two parts)
As long as your joints look even, it's more important that you avoid a large grout line at the last tile than worry about sticking to the exact measurement of the spacer.— Jennifer Stimpson Stiff spacers of low-expansion materials … may be used to provide a fixed spacing between the end mirrors.— Arthur L. Schawlow Use wood shims or spacers where necessary to compensate for wavy ceilings and to make certain the bottom surfaces of all strips are flush.— Bernard Gladstone
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Merriam-Webster unabridged
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Time Traveler for spacer
The first known use of spacer was in 1857
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